I would disagree at what I believe your assertion to be, which is that there is no value in retailing. If this were so, then why would there be any retailers? Why would there be shopkeepers?
No, there is value is retailing, establishing and maintaining the buyer contacts to obtain the merchandise, in putting the merchandise in customer attracting displays (or not, venue and marketing pitch depending), there is value in servicing the customer, making the sale, tending the payment, wrapping up the purchase, and accepting the return, should it be unsatisfactory or defective.
In the fast food venue, the value is in cooking and preparing the food, establishing and maintaining the connections upstream in the value chain, taking the order, tendering the payment, and keeping the establishment properly clean and the food properly prepared.
There are many jobs in retailing and food service, albeit most at the lower end of the wage scale, that add value.